The attacks targeted a secondary school in the northeastern town of Lassa, in Borno State.

At least 37 students remain missing after gunmen raided their school in northeast Nigeria, according to local officials.

The attack occurred on Monday when assailants from the Islamic State West Africa Province (ISWAP) group stormed a secondary school in the town of Lassa, in Borno State, which has faced years of violence by armed groups.

The AFP news agency reported on Tuesday that at least 37 students remain missing following the attack, which occurred while they were sitting exams.

At least three people were killed in the attack, including a soldier and a teacher, according to the military, who initially said that authorities had rescued 10 of them and that only one remained missing.

The “list of students in captivity”, showing the students’ genders and their parents’ mobile phone numbers, was shared with journalists by the area’s local government councillor, Ijagla Ijabila.

An intel source also showed AFP the same list.

Borno Commissioner for Education Lawan Abba Wakilbe told reporters in Lassa that 25 female students, 11 male students and one staff member were still being held, reported the Reuters news agency.

Abba Wakilbe added that eight people, including the school’s vice principal, have been freed.

Kidnapping for ransom, especially of students, has become a common tactic for both armed groups and non-ideological “bandit” gangs operating across the country’s conflict-hit north and centre.

While the 2014 kidnapping of hundreds of schoolgirls from the town of Chibok by members of Boko Haram remains Nigeria’s most infamous, school abductions continue to be prevalent across the country.

In May, gunmen kidnapped more than 40 pupils – who remain in captivity – from Borno State’s Mussa village.

That same month, armed men rounded up dozens of schoolchildren from three schools in Oyo State – a rare attack in southwest Nigeria, considered to be the safest region in the country.

Nigeria has been fighting an armed uprising since 2009, concentrated in the northeast.

While violence has waned since the peak of the conflict a decade ago, analysts have warned of an uptick in attacks since last year.